\ 



21(3 



\ 



Underwood : The Genus PnANEROPHLEinA 



3. The uncertainty of referring to collectors* numbers unless 



the special herbaria in which the plant is consulted is also added. 

 While the numbers of certain collectors are almost always homo- 

 geneous and represent a single species, those of certain other col- 

 lectors are notorious for the want of uniformity of the specimens, 

 ^ince the commercial rather than the scientific conception has gov- 

 erned their distribution. 



4. The crying necessity for field workers to give more atten- 

 tion to the subterranean portions of plants and their habits of 

 growth. In all of the large collections of the species described 

 above that have been examined in the best herbaria, we are still in 

 practical ignorance of the rootstock and growth characters of 

 nearly all the species. To understand .biological characters and 

 relationships we must know more than the average specimens of a 

 J tortus siccus can reveal. 



IS^cplanatioii of Plates 



n.ATE 359 



1. T.owcr pinna of /'. juglaudifolia \ the outline drawn direct from Humboldt's 

 plant in the Willdenow herbarium. 



2. P. piiniila from Chiapas, ( Ihiesbreg^ht. 



3,4. /'. aiDiiulata {xovci Chihuahua, Prinfjle, showing different development of 

 the basal auricle. 



5. P. ttmhouata^ INlonterey, I'ringle. 

 All the figures are natural size. 



Plate 360 



1. P, jiiglandifo'ia from Humboldt's plant in the Willdcnow lierbariurn. 



2. P. auriculaia. 



3. P. reifwthpora. 



4 



y. tonbonaia. 



5. P- nobilis, 



6. /'. nob'disy from the same leaf as No. 5 but slightly more magnified. 



The figures were drawn from the leaves by direct tracings with a I.eitz projection 



-apparatus, and are magnified about 2^ diameters. ' 



Doth plates were drawn under my direction by T\liss M E. Baker. 



CoLUMiUA Univfrsity, 4 April, 1899. 



